'Mr. Floyd died from a low level of oxygen' -doctor

Chauvin knelt on the neck of George Floyd for more than nine minutes once he was handcuffed and prone.

Tobin told jurors the main forces that led to Floyd's shallow breath were "that he's turned prone on the street, that he has the handcuffs in place combined with the street, and then that he has a knee on his neck and then that he has a knee on his back and on his side."